PM6685 STMicroelectronics Integrated Circuit (Quad Flat No-Lead) In Stock
PM6685 is a dual PWM voltage-mode DC-DC controller in a 32-pin VFQFPN package, supporting 4.5 V to 28 V input for synchronous buck converter designs. It integrates two independent PWM channels with programmable frequency and soft-start, targeting server, telecom, and industrial multi-rail power supply applications.
- Manufacturer
- STMicroelectronics
- Package
- Quad Flat No-Lead
- Pin Count
- 32
- Lifecycle
- OBSOLETE
- Datasheet
- PM6685 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual independent PWM voltage-mode buck controller in one 32-pin VFQFPN
- Wide 4.5 V to 28 V input voltage range for 12 V bus and 24 V industrial rails
- Programmable switching frequency and independent soft-start per channel
- Drives external N-channel MOSFETs for high-efficiency synchronous rectification
- Voltage-mode control with adjustable output voltage via external resistor divider
- Over-current, over-voltage, and under-voltage protection on both channels
- Compact 32-pin VFQFPN exposed-pad package for low thermal resistance
Applications
The PM6685 is designed for multi-rail server and telecom power boards where a single controller must generate two independently regulated DC outputs from a 12 V or 24 V bus. Its dual-channel architecture reduces component count and PCB area in industrial power supplies converting 24 V to 5 V and 3.3 V simultaneously. It is also applied in networking equipment and point-of-load converters on FPGA evaluation boards requiring tight voltage regulation on two separate rails.
Specifications
| Manufacturer Package Code | VFQFPN |
| YTEOL | 0 |
| Analog IC - Other Type | DUAL SWITCHING CONTROLLER |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 28V |
| Input Voltage-Min | 4.5V |
| Input Voltage-Nom | 12V |
| JESD-30 Code | S-XQCC-N32 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | LCC32,.2SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | PUSH-PULL |
| Switching Frequency-Max | 500kHz |
| Temperature Grade | COMMERCIAL EXTENDED |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many independent buck converter channels does PM6685 control and from what input voltage?
PM6685 controls 2 independent synchronous buck converter channels, both driven from a shared input of 4.5 V to 28 V. Each channel has its own PWM gate driver outputs, soft-start timer, and voltage feedback network, allowing two different output voltages to be generated simultaneously from a single 12 V or 24 V supply bus.
For a server power board, what output voltages can PM6685 generate from a 12 V bus?
With external resistor divider networks, PM6685 can be programmed to produce any output voltage from approximately 0.6 V to the input voltage minus a small headroom. Common server applications configure it to generate 5 V and 3.3 V simultaneously, or a 1.8 V core rail and a 1.0 V memory termination voltage from the 12 V bus.
What protections does PM6685 include to safeguard external power components?
PM6685 integrates over-current protection with programmable current limit, over-voltage protection that shuts down the affected channel if the output exceeds a defined threshold, and under-voltage lockout below 4.5 V input. These 3 hardware protection layers prevent MOSFET damage and load failures during fault conditions without requiring additional external protection ICs.
How compact is the PM6685 package for high-density power supply PCB layouts?
PM6685 comes in a 32-pin VFQFPN package measuring 5 mm × 5 mm with an exposed thermal pad that reduces junction-to-board thermal resistance to below 10°C/W. This compact footprint allows the complete dual-channel buck power stage, including inductors and capacitors, to fit within a 20 mm × 25 mm area on a 4-layer PCB.
Can PM6685 replace two single-channel buck controllers in an existing design to reduce BOM cost?
Yes, PM6685 integrates the functionality of 2 single-channel PWM controllers in one 32-pin package, directly replacing two separate single-channel devices and reducing the controller IC count from 2 to 1. This consolidation typically saves 2 to 4 passive decoupling components per controller and reduces PCB routing complexity for a net BOM saving of 5 to 8 components.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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